单选题Their business flourished at its new location a year later owing to their joint efforts and hard work.

单选题 Computer Mouse The basic computer mouse is an amazingly clever invention with a relatively simple design that allows us to point at things on the computer and it is very productive. Think of all the things you can do with a mouse like selecting text for copying and pasting, drawing, and even scrolling on the page with the newer mice with the wheel. Most of us use the computer mouse daily without stopping to think how it works until it gets dirty and we have to learn how to clean it. We learn to point at things before we learn to speak, so the mouse is a very natural pointing device. Other computer pointing devices include light pens, graphics tablets and touch screens, but the mouse is still our workhorse. The computer mouse was invented in 1964 by Douglas Englehart of Stanford University. As computer screens became more popular and arrow keys were used to move around a body of text, it became clear that a pointing device that allowed easier motion through the text and even selection of text would be very useful. The introduction of the mouse, with the Apple Lisa computer in 1983, really started the computer public on the road to relying on the mouse for routine computer tasks. How does the mouse work? We have to start at the bottom, so think upside down for now. It all starts with the mouse ball. As the mouse ball in the bottom of the mouse rolls over the mouse pad, it presses against and turns two shafts. The shafts are connected to wheels with several small holes in them. The wheels have a pair of small electronic light-emitting devices called light-emitting diodes (LED) mounted on either side. One LED sends a light beam to the LED on the other side. As the wheels spin and a hole rotates by, the light beam gets through to the LED on the other side. But a moment later the light beam is blocked until the next hole is in place. The LED detects a changing pattern of light, converts the pattern into an electronic signal, and sends the signal to the computer through wires in a cable that goes out of the mouse body. This cable is the tail that helps give the mouse its name. The computer interprets the signal to tell it where to position the cursor on the computer screen. So far we have only discussed the basic computer mouse that most of you probably have or have used. One problem with this design is that the mouse gets dirty as the ball rolls over the surface and pieks up dirt. Eventually you have to clean your mouse. The newer optical mice avoid this problem by having no moving parts.

单选题Evolution has hardly changed the horseshoe crab over millions of years.A. carefullyB. probablyC. scarcelyD. slowly

单选题Don"t be so childish !

单选题Although South Carolina's mineral resources are {{U}}abundant{{/U}}, not all of them can be mined lucratively.

单选题All the people assembled at Mary's house.A. collectedB. fixedC. assertedD. assist

单选题下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文中没有提及，请选择C。 Smoking will be banned in all pubs, clubs and workplaces from next year after historic votes in the Commons last night. After last-minute appeals from health campaigners, MPs opted for a blanket prohibition which will start in summer 2007, ending months of argument over whether smokers should be barred in pubs and restaurants only. They voted to ban smoking in all pubs and clubs by 384 to 184, a surprisingly large majority of 200．Smoking will still be allowed in the home and in places considered to be homes, such as prisons, care homes and hotels. Smokers lighting up in banned areas will face a fixed penalty notice of ￡ 50 and spot fines of ￡ 200 will be introduced for failing to display no-smoking signs, with the possible penalty, if the issue goes to court, increasing to ￡ 1,000. Carpline Flint, the Public Health Minister, also announced that the fine for failing to stop people smoking in banned areas would be increased to ￡ 2,500-more than ten times the ￡ 200 originally proposed. The Bill also allows the Government to increase the age for buying cigarettes. Ministers will consult on raising it from 16 to 18. The Bill now goes to the Lords but will be through by the summer recess. Even a plan to allow smoking to continue in private clubs was thrown out as MPs on all sides were given permission to vote with their conscience rather than on a party line. Patricia Hewitt, the Health Secretary, said the Health Bill would ban smoking in "virtually every enclosed public place and workplace" in England and save thousands of lives a year. Smoke-free workplaces and public places "will become the norm". She said: "An additional 600,000 people will give up smoking as a result of this law and millions more will be protected from second-hand smoke. " Peter Hollins, director-general of the British Heart Foundation, said: "The vote is a landmark victory for the public health of this country and will save the lives of many people. "

单选题He doesn't like the children who are prone to telling a lie.A. reliableB. liableC. promisingD. declined

单选题Medicine depends on other fields for basic information, {{U}}particularly{{/U}} some of their specialized branches.

单选题 How does Organisms Ward off Invaders The livelihood of each species in the vast and intricate assemblage of living things depends on the existence of other organisms. This interdependence is sometimes subtle, some times obvious. Perhaps the most straightforward dependence of one species on another occurs with parasites, organisms that live on or in other living things and derive nutrients directly from them. The parasitic way of life is widespread. A multitude of microorganisms (including viruses and bacteria) and an army of invertebrates or creatures lacking a spinal column (including crustaceans, insects, and many different types of worms) make their livings directly at the expense of other creatures. In the face of this onslaught, living things have evolved a variety of defense mechanisms for protecting their bodies from invasion by other organisms. Certain fungi and even some kinds of bacteria secrete substances known as antibiotics into their external environment. These substances are capable of killing or inhibiting the growth of various kinds of bacteria that also occupy the area, thereby eliminating or reducing the competition for nutrients. The same principle is used in defense against invaders in other groups of organisms. For example, when attacked by disease-causing fungi or bacteria, many kinds of plants produce chemicals that help to ward off the invaders. Members of the animal kingdom have developed a variety of defense mechanisms for dealing with parasites. Although these mechanisms vary considerably, all major groups of animals are capable of detecting and reacting to the presence of "foreign" cells. In fact, throughout the animal kingdom from sponges to certain types of worms shellfish, and all vertebrates (creatures possessing spinal column) , there is evidence that transplants of cells or fragments of tissues into an animal are accepted only if they come from genetically compatible or closely related individuals. The ability to distinguish between "self" and "non-self", while present in all animals, is most efficient among vertebrates, which have developed an immune system as their defense mechanism. The immune system recognizes and takes action against foreign invaders and transplanted tissues that are treated as foreign cells.

单选题 下面有3篇短文，每篇短文后有5道题，每道题后面有4个选项。{{B}}第一篇{{/B}} {{B}}Some Things We Know about Language{{/B}} Many things about language are a mystery, and many will always remain so. But some things we do know. First, we know that all human beings have a language of some sort. There is no race of men anywhere on earth so backward that it has no language, no set of speech sounds by which the people communicate with one another. Furthermore, in historical times, there has never been a race of men without a language. Second, there is no such thing as a primitive language. There are many people whose cultures are undeveloped, who are, as we say, uncivilized, but the languages they speak are not primitive. In all known languages we can see complexities that must have been tens of thousands of years in developing. This has not always been well understood; indeed, the direct contrary has often been stated. Popular ideas of the language of the American Indians will illustrate. Many people have supposed that the Indians communicated in a very primitive system of noises. Study has proved this to be nonsense. There are, or were, hundreds of American Indian languages, and all of them turn out to be very complicated and very old. They are certainly different from the languages that most of us are familiar with, but they are no more primitive than English and Greek. A third thing we know about language is that all languages are perfectly adequate, That is, each one is a perfect means of expressing the culture of the people who speak the language. Finally, we know that language changes. It is natural and normal for language to change; the only languages which do not change are the dead ones. This is easy to understand if we look backward in time. Change goes on in all aspects of language. Grammatical features change as do speech sounds, and changes in vocabulary are sometimes very extensive and may occur very rapidly. Vocabulary is the least stable part of any language.

单选题The new technological revolution in American newspapers has brought increased issue volume , a wider range of publications and an expansion of newspaper jobs.

单选题The moon was obscured by thick clouds.

单选题Mother Knows the Best? Once while being prepped for a television interview, I was chatting with the host about stay-at-home fathers. I made the point that one reason we're seeing more stay-at-home dads may be that it's no longer a given that a man makes more money than his wife. Many families now take earning power into account when deciding which parent will stay home. At that point, one of the male crew members commented, almost to himself but loud enough for my benefit, "It should be the better parent who stays home." A lot .of guys say things like that. Usually it's code for, "My wife (read: any woman) is the better parent." I was a stay-at-home father for eight years, so his declaration made me bristle. It implied that our family's choice could only have been correct if I was a "better" parent than my wife. I think men shoot themselves in the foot with this kind of thinking. I suppose an argument could have been made that when I began staying home my wife was the "better" parent: She had spent more time with Ry, could read him better and calm him more quickly. And given a choice, he'd have picked her over me. But as she was the more employable one, my wife went out to work and looked after our son. Know what? I caught up. Because of the increased time I spent with him. I soon knew Ry well, understood what he needed and could look after him more or less as well as my wife could. Actually, the experience helped me unlock one of the world's great secrets: Women are good at looking after children because they do it. It's not because of any innate female aptitude or a mother's instinct— which I think is mostly learned anyway. It's because they put in the time and attention required to become good at the job. Women obviously get a biological head start from giving birth and nursing. But over the long term experience is more important. When I got the experience myself, I was good, too. As good? I don't know. Who cares? Children are not made of glass, other people ale capable of looking after them besides Mom.

单选题She can be relied on in a crisis.A. looked afterB. believed inC. turned onD. depended on

单选题The explosion scattered a flock of birds roosting in the trees.

单选题She has such exceptional abilities that everyone is jealous of her.

单选题I warned him to keep the matter confidential.A. privateB. safeC. personalD. secret

单选题If there should be human beings on other planets, they would be radically different from Americans.

单选题It was a fascinating painting, with clever use of color and light. A. new B. familiar C. large D. wonderful